[gambit-list] Valid namespace prefix

How come Gambit enforces the module# syntax for namespaces? I have just started using them, and have looked at many posts describing the system, but I don't remember anyone explaining the reason for this syntax.

For example, trying anything different than module gives an error:

(namespace ("foo:"))

*** ERROR IN (console)@1.13 -- Ill-formed namespace prefix

I would like to use the colon syntax as I find it much more readable, especially for user-land code. I'm going to usually use fully qualified names, so this slight readability improvement is important. Is there a reason I shouldn't be able to do this?